Not really correcting you per se, just giving you the latest info. Luckily we have yet to experience a restaurant that has added 18 - 25% to the bill just because they could. The only time we’ve had that experience was when we had a large group, except when we lived in Europe.
I’ve seen two places we usually about once a month eat at put a place on the bill for a tip. However I think it is to accommodate customers who use plastic to pay and want a tax record and are on an expense account. I put $0 on the bill and use my debit card. I pay the waitress personally in cash.